104,852 research outputs found
Temperature tolerance and thermal environment of european seed bugs
No full textHeteroptera, or true bugs populate many climate zones, coping with different environmental conditions. The aim of this study was the evaluation of their thermal limits and derived traits, as well as climatological parameters which might influence their distribution. We assessed the thermal limits (critical thermal maxima, CTmax, and minima, CTmin) of eight seed bug species (Lygaeidae, Pyrrhocoridae) distributed over four Köppen–Geiger climate classification types (KCC), approximately 6° of latitude, and four European countries (Austria, Italy, Croatia, Bulgaria). In test tubes, a temperature ramp was driven down to −5°C for CTmin and up to 50°C for CTmax (0.25°C/min) until the bugs’ voluntary, coordinated movement stopped. In contrast to CTmin, CTmax depended significantly on KCC, species, and body mass. CTmax showed high correlation with bioclimatic parameters such as annual mean temperature and mean maximum temperature of warmest month (BIO5), as well as three parameters representing temperature variability. CTmin correlated with mean annual temperature, mean minimum temperature of coldest month (BIO6), and two parameters representing variability. Although the derived trait cold tolerance (TC = BIO6 − CTmin) depended on several bioclimatic variables, heat tolerance (TH = CTmax − BIO5) showed no correlation. Seed bugs seem to have potential for further range shifts in the face of global warming
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
A review of Nearctic and some related Anthribidae (Coleoptera)
No full textTaxonomy, synonymy, distribution, and biologies of Nearctic (and a few Neotropical and Pale arctic) Anthribidae are reviewed, new keys are provided, and four new genera and eleven new species are described. Allandrus Leconte, 1876 (=Tropiderinus Reitter, 1916). Anthribus Geoffrey, 1762 (=Pseudobrachytarsus Pierce, 1930). Araecerus Schoenherr, 1823 (=Araeocorynus Jekel, 1855); Araecerus coffeae Fabricius, 1801 (=Tropideres (Rhaphitropis) mateui Cobos, 1954). Brachycorynus n. gen., type species Tropideres rectus Leconte, 1876; congeneric: Homocloeus distentus Frieser, 1983 from Cuba and Florida, and B. hirsutus n. sp. from Texas. Choragus major n. sp., Ohio, etc., striolatus n. sp., Ohio, and exophthalmus n. sp., Virginia. Corrhecerus Schoenherr, 1826 (=Paranthribus Jordan, 1904) resulting in Corrhecerus rufescens (Jordan, 1904), new combination. Eurymycter Leconte, 1876, and Gonotropis Leconte, 1876, are removed from synonymy with Tropideres Schoenherr, 1823, and returned to full generic rank. Eusphyrus Leconte, 1876 is removed from synonymy with Ormiscus Waterhouse, 1845, and returned to full generic rank; Tropideres (Opisthotropis) vasconicus Hoffmann and Tempere, 1954, from France is transferred to Eusphyrus, with Opisthotropis a generic synonym; Eusphyrus pulicarius Boheman, 1859, Brasil, is transferred from Brachytarsus, and the species eusphyroides Schaeffer and quercus Schaeffer are transferred from Ormiscus. Gymnognathus triangularis n. sp., Texas. Habroxenus n. gen., type species H. politus n. sp., Texas and Maryland, also H. fuscus n. sp., Guatemala, and H. sarmenticola n. sp., Haiti. Neoxenus n. gen., type species N. versicolor n. sp., Texas, etc.; congeneric: Notioxenus ater and polius Jordan, 1907, Central America, andpallipes Suffrian, 1870, Cuba. Phoenicobiella trituberculata (Suffrian, 1870, Cuba) transferred from Toxonotus Lacordaire, 1866. Piesocorynus lateralis Jordan, 1906 (=P. virginicus Leng, 1918). Sicanthus n. gen., type species S. rhizophorae n. sp., Florida. Toxonotus bipunctatus Schaeffer, 1904 (=Neanthribus obtusus Jordan, 1906); Toxonotus penicellatus Schaeffer, 1906 (=Neanthribus segregus Jordan, 1906); Toxonotus vagus Horn, 1894 (=Neanthribus hieronymus Jordan, 1906). Trigonorhinus lepidus n. sp., California; Trigonorhinus limbatus Say, 1827 (=Brachytarsus plumbeus and B. vestitus Leconte, 1876, and Brachytarsoides minor, quadratus, quadratus ssp. nigrinus and rufodorsalis Dethlefsen, 1954); Trigonorhinus grise us Leconte, 1876 (=Brachytarsus riddelliae Schaeffer, 1906, and Brachytarsoides cylindratus, elongatus, nevadensis, nevadensis ssp. tigrinus, and vulgaris Dethlefsen, 1954); Trigonorhinus tomentosus Say, 1827 (=Brachytarsus paululus Casey, 1884, B. beyeri Schaeffer, 1906, B. franseria Barrett, 1931, and B. irregularis Tanner, 1934); Trigonorhinus zeae Wolfrum, 1931 (=Opanthribus trimaculatus Senoh, 1986); Trigonorhinus areolatus Boheman, 1845 (=Tropideres (Tropideres), bagueni Cobos, 1954, Spain). Introgressive hybridization is invoked for the Trigonorhinus limbatus-griseus complex. New keys are provided for the species of Brachycorynus, Choragus, Habroxenus, Neoxenus, Phoenicobiella, Trigonorhinus, and Eusphyrus, plus a new key to Nearctic tribes and genera, and a new Nearctic checklist. New distribution and life-history data are given for many species
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
The construction of Karen Karnak: The multi-author-function
No full textThis thesis is situated within the comparatively recent developments of Web 2.0 and the emergence of interactive WikiMedia, and explores the mode of authorship within a Read/Write culture compared to that of a Read/Only tradition. The hypothesis of this study is that the role of the audience has become merged with the author, and as such, represents new functions and attributes, distinct from a more conventional concept of authorship, in which the roles of audience and author are more separate. Read/Write and participatory culture, as defined by this study, is focused on collaboration, and includes the influences of D.I.Y. culture, Open-Source practices and the production of text by multiple authors. Multi-authorship presents a re-thinking of several concepts which support the notion of the individual author, since the focus of multi-authorship is not on attribution and ownership of a finished text, but on the continued malleability of a text. Modes of multi-authorship, demonstrated in the use of the pseudonyms Alan Smithee and Karen Eliot, represent declarative authors whose names signify multiple origins, whilst concurrently indicating a distinct body of work. The function of these names form an important context to this study, since primary research involves the construction of an experimental mode of multi-authorship utilising WikiMedia technology and the interaction of thirty nine participants, who are invited to create a body of work under the collective pseudonym Karen Karnak. The data generated by this experiment is analysed using aspects of Michel Foucault's author-function to identify and determine power structures inherent in the WikiMedia context. The interplay of power structures, including concepts such as identity, ownership and the body of work, affect the resulting mode of authorship and contribute to the construction of Karen Karnak, suggesting further areas of research into the emerging multi-author
Contribution of Information and Communication Technology (ICT) in Country’S H-Index
No full textThe aim of this study is to examine the effect of Information and Communication Technology (ICT) development on country’s scientific ranking as measured by H-index. Moreover, this study applies ICT development sub-indices including ICT Use, ICT Access and ICT skill to find the distinct effect of these sub-indices on country’s H-index. To this purpose, required data for the panel of 14 Middle East countries over the period 1995 to 2009 is collected. Findings of the current study show that ICT development increases the H-index of the sample countries. The results also indicate that ICT Use and ICT Skill sub-indices positively contribute to higher H-index but the effect of ICT access on country’s H-index is not clear
Fully Turbulent Mean Velocity Profile for Purely Viscous non-Newtonian Fluids
No full textThe characteristic near wall behavior of turbulent flow of purely-viscous non-Newtonian fluids is discussed for both power-law (P.-L.) and Herschel-Bulkley (H.-B.) rheological models. A proper scaling is presented for H.-B. fluids to establish an analogy with power-law fluids with same flow index. To provide reference data for turbulent flow of non-Newtonian fluids, DNS simulations of power-law fluids are conducted in a rectangular channel for a large range of power-law indices ( = 0.5, 0.69, 0.75, 0.9, 1, 1.2). The DNS data show that the mean velocity profile in the viscous and logarithmic layers follow expressions of the form and respectively, where shows a logarithmic dependency on the flow index.Comparison with some experimental data shows the above formulation to be valid for Reynolds numbers (based on shear velocity) as high as 1000
H-index and research evaluation: A suggested set of components for developing a comprehensive author-level index
No full textThe H-index has been investigated in various studies; this index has many strengths that have made it popular. However, it also has weaknesses, due to which other indicators have been developed. This study aims to identify the strengths and weaknesses of the H-index and provide the minimum set of necessary components for developing a comprehensive author-level index. In this systematic literature review, Scopus, PubMed, Web of Science, Emerald, and ProQuest databases were searched to identify relevant studies. From the number of 14,253 retrieved studies, after two stages of screening, 81 studies were selected according to the eligibility criteria for data extraction. The findings of the study led to the identification of 15 strengths in the three categories of Quality Features, Simplicity, and Suitability, and 13 weaknesses in the six categories of Publications, Citations, Academic Age, Author Credit Allocation, Variety of Fields, and mathematical calculation for H-index. Finally, 28 components were identified as the minimum set of necessary components to develop a comprehensive author-level index to help evaluate researchers more realistically and fairly. The minimum components that need to be considered in developing a comprehensive author-level index can be proposed as follows: Quality Features, Simplicity, Suitability, Publications, Citations, Academic Age, Author Credit Allocation, Variety of Fields, and mathematical calculation
Letter from Bob H. Suzuki, President, CSU Pomona, June 13, 1993
No full textA letter from President Bob H. Suzuki thanking guests of a garden reception and asking for their support to fund Michi Nishiura and Walter Weglyn Endowed Chair in Multicultural Studies.These materials are from box 73 and 74 of the Frank Chin Papers. The Frank Chin Papers contain personal and professional correspondence between Frank Chin and Michi Weglyn relating to particular projects on which either author was working as well as files related to the Day of Remembrance Tribute to Michi Weglyn
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